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Single-Switch Four-String Step-Down LED Driver with Passive Current Balancing
Received:December 04, 2018  Revised:December 04, 2018
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DOI:
Keywords:passive current balancing  single-switch  step-down  four-string
Fund Project:Project Supported by National Natural Science Foundation of China (51707126)
           
AuthorInstitutionEmail
ZHANG Zhefeng 943759315@qq.com
LIU Xueshan College of Electrical Engineering and Information Technology, Sichuan University xueshan5851@163.com
WANG Chuntao College of Electrical Engineering and Information Technology, Sichuan University
WAN Yuyang College of Electrical Engineering and Information Technology, Sichuan University
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Abstract:
      A single-switch four-string step-down LED driver with passive current balancing is proposed and analyzed. The proposed LED driver can realize the current balancing of each LED branch. Therefore, by controlling one output current, the output current of other LED strings can be controlled via passive current balancing, which makes its control simple. The proposed LED drivers use only one active switch, which decreases the volume of circuit and simplifies the control loop. Compared with the traditional multi-string LED driver, the proposed LED achieves non-isolated step-down conversion, which benefits from small size and low cost. Finally, a prototype of four-string LED driver with 100W output is built to verify the studied results.
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